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what values have to be defined in the model to run the "eigen" function? I am not clear on what is going on. I am looking at a simple sdof system so the eigenvalue is easy to calculate by hand...
thanks,
Matthew

I was using and older version of OpenSees. Does the element recorder not work for older versions? Thanks.

I was using and older version of OpenSees. Does the element recorder not work for older versions? Thanks.

I am trying to do something very simple...run a SDOF type system thru an EQ and record the displacement and forces. The recorder for the element forces comes up with a long column of zeros? Why? Whats a better approach to this simple problem that works? Thanks! Matthew (note, the code calls la21 gro...